Ehu usage in amps

Discussion in 'Motorhome Chat' started by flatpackchicken, Apr 12, 2013.

1. flatpackchickenFunsterLife Member

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Just found this useful bit of info about EHU re wattage used and what amps are being used???
Regards Garry Flatpackchicken
Heres a chart to help you calculate your electrical items useage when using EHU.
60 Watts = 0.26 Amp
100 Watts = 0.43 Amp
200 Watts = 0.87 Amp
300 Watts = 1.30 Amp
400 Watts = 1.74 Amp
500 Watts = 2.17 Amp
600 Watts = 2.61 Amp
700 Watts = 3.04 Amp
800 Watts = 3.48 Amp
900 Watts = 3.91 Amp
1000 Watts = 4.35 Amp
1100 Watts = 4.78 Amp
1200 Watts = 5.22 Amp
1300 Watts = 5.65 Amp
1400 Watts = 6.09 Amp
1500 Watts = 6.52 Amp
1600 Watts = 6.96 Amp
1700 Watts = 7.39 Amp
1800 Watts = 7.83 Amp
1900 Watts = 8.26 Amp
2000 Watts = 8.70 Amp
2100 Watts = 9.13 Amp
2200 Watts = 9.57 Amp
2300 Watts = 10.00 Amp
2400 Watts = 10.43 Amp
2500 Watts = 10.87 Amp
2600 Watts = 11.30 Amp
2700 Watts = 11.74 Amp
2800 Watts = 12.17 Amp
2900 Watts = 12.61 Amp
3000 Watts = 13.04 Amp
3100 Watts = 13.48 Amp
3200 Watts = 13.91 Amp
3300 Watts = 14.35 Amp
3400 Watts = 14.78 Amp
3500 Watts = 15.22 Amp
This article is meant as a general guide only. You must take professional advice when using or considering installing electricity in your tent, or caravan motorhome or RV.

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2. ReallyretiredFunster

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While true, to convert watts to amps, just divide by 230 (the mains voltage) or if a 12v appliance, by 12.

As a guide I find it easier to divide in my head by 250, so 1000w = 4amps (actually the correct figure is 4.34A) which is near enough for most purposes .:thumb:

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3. GromettFunster

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Whilst spec wise true, in reality divide by 240V in the UK :Wink:

But I am the same as you and use 250 in rough and ready calcs.

4. oldunRead Only Funster

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I thought that the whole of Europe was going to set (harmonise) voltages to 230V?

The actual MH socket your MH socket may be lower due to the long site distrubution lines.

5. pappajohnFunsterLife Member

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Correct....

UK voltage is now 230v with a tolerance of +10% (253v) and -6% (216v)

it was 240v before harmonisation.

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6. scotjimlandFunsterLife Member

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It already is harmonised, The UK is 230 V .. with a tolerance of +10%/−6%

as an aside, I've been on Spanish sites and measured it as low as 220v ..

but this is all academic .. for easy mental calculations, as Reallyretired said.. use the rule of thumb as 4 amps per kw and you won't go wrong..

edit.. just beat me to it John :Laughing:

Last edited: Apr 13, 2013
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7. Ed ExcelFunster

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I think you'll find it's changed to +-10% if you look at BS EN 50160:2000 Voltage characteristics of electricity supplied by public distribution systems.

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its all eu double speak as youll still get 240v 99% of the time in uk they set the limits to include virtually everyones existing voltage

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9. GromettFunster

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When the spec was harmonised they didn't rip out all the power stations, generators and substations and replace the 240V ones with 230V ones. Nothing changed. We are still on 240V. If you don't believe me put a multimeter into your power socket...

Mine is currently reading 243v...

All they did was a bureaucratic exercise as is typical of the EU.

Uk is 240V, France is 230v so they chose a tolerance range that included both voltages.

The voltage near a sub station tends to be higher to allow for voltage drops at the end of a long line. I have seen as high as 246v. I have seen as low as 235 on a campsite at the end of a long run.

10. Ed ExcelFunster

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The important point is, 230 is the nominal figure which manufacturers of electrical equipment should be working to, for goods to be used in the EU, with cognisance of tolerances. And, if you are thinking of purchasing something made outside the EU you may also find this info useful.

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11. GromettFunster

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We moved away from the important point after the first post in the thread :Wink::Rofl1: My responses about the actual voltage being 240v was in response to

The true usage is gained by using actual values not by use the center spec value created by eurocrats. In the case of the UK the voltage is actually 240V. You will quite often see power supplies these days which tend to be switch mode having a much bigger voltage range than is needed. My laptop power supply works from 100v - 260v. So the supply is not designed around the eurocrat 230v spec at all.

I prefer to either use the rough and ready 250v if it is for rough and ready purposes, OR I use accurate voltages if the calculation actually matters. In the case of the UK it is 240V.

Anyway, we are into the fun pedantic territory now.

PS: Not having a dig at reallyretired here.

12. olleyFunster

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You bunch of pedants :Rofl1: I have always used 250v, and 10amps at 12v for 100watts of inverter power, both plenty good enough for basic wiring, why make life complicated.:BigGrin:

Ian

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13. motorhomerRead Only Funster

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This is all academic! The voltage that matters is the ACTUAL voltage on a site and - especially on some remoter sites on the continent - this can be miles away from the theoretical figure and will vary according to load at the site.

My fridge has auto power source selection, and it uses mains in preference but switches to gas if the mains voltage drops below 190. in the UK it always selects mains. In Spain sometimes it does but sometimes it doesn't. Recently got back from morocco and it hardly ever worked on mains there (at least when left on Auto, you can over-ride it). Sometimes the fridge will be working on mains but then switch to gas if I switch on the electric boiler, whose load causes the voltage to drop (but again not in the UK where 240v and 16amp are pretty reliable)

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